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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85cc30d64808c8b4ae76daa3240f76af0b4c05a1e46433b09415ce3de85949a' 
  AND token = 'sAkrcRu0yX6w/XuNctTeAcsZsIKR4GXne9y/yppHYr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}