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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bd18e695c0b5187bc4098222ae67a22a611522808677b0b0a160c89116cd04' 
  AND token = 'O6i+lX3CnL9kf+Xwtqwo8G8ROSvBf7kZq/Jcf82XzYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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