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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46a22e2eb88079a3f49ca039c99789098caf579f360e2bf8a1efb2d8f8499b8' 
  AND token = '+Bj3E1lGPqaQV4xdeCr0Q4Y6uD2GDjV7LKtFEgId7Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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