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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9503b0ee90f037cf41ddf365204baa41ca57a3a52d2ff87e0d822109b1f640' 
  AND token = '2Fu63/CKyFIDA3A34abJMZc4KrjZDNlqPWQfciS6RZo=' 
  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"
    }
  }
}