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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e9d35a03e38ed25eb29a3002bcf25554668a616118c9d7d336787c650e0404' 
  AND token = 'r3i2v84iy5vKLrkiiOWOUZzYAO7+pohUDCETV3dqHcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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