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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efda05594185858533b64a5193dc1c9c97dbd9056fc8ee899e0b9564b434e240' 
  AND token = 'FUHAYDHY57Lu2oPkL2Nu7UvK2C6PDlt+3nbTddY8YJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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