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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4b4426ec9c07d387bbe0d41bafc047de3f8455071a72d05ce32525b4a5a939' 
  AND token = 'J9H7/gg+kw5WAY9R7f6qe+dIi8V6nXXNdrOWgqG2QMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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