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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad7ec2d3b5aa63ebf68015167aa6c889b1a62aba40b10523a23f008d618a69a' 
  AND token = 'ihMGibz+ZTkGlsqL3PHTuURFxZc5NMsYZd3oHMeWHHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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