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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cc997d8ff1c371634cd808a0f7cab6c911ee0fc633a97df492ed14f7024571' 
  AND token = 'K4RkENhD7hQ6Lc0qoXrVn7Y73acQGbw5H/yHSOp5MFA=' 
  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"
    }
  }
}