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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3231bde4e23fcac787551af5168e6b6746320b5a71b13ea6323638a663ba8dd' 
  AND token = 'knCu/M5Z+ktf++1xYWqpKTyLZXUviT7d8XNPx5Ndm1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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