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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5559e6a3733e2fb90cbb7bede68fc1ffd53d1f85586286fc6ef261dd22a8d88e' 
  AND token = 'U46iV0MJ70Eq5JDKM2SBpChrr6olygHtrCyH4OobbBk=' 
  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"
    }
  }
}