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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7513ac73550e320dc3c2c493d1b2361eb4fd7fca2d3214ef3aba11e436a5a5c7' 
  AND token = 'YlvzxPP4lmyU1rMn9hqqMd0QGVeRhYiQ5dO7iM5vmNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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