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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1807c47114bd0e01dc53c9fdd15a77de1d89cb0e864a39ead1ea838ba4ea7f' 
  AND token = 'NBBXv4/KMB1MrMFLCNI/7MZWJ8OFMISK2VZzyAIK3+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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