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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a4f0cd74eb5b054fb6d6c82ee0fe9bd8102bc1ebad914afd318a184dd27ce7' 
  AND token = 'CDrb2rKxlG6u/CUPSBh+TkZlOGtlGOHoz8yfP7JylTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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