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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab314ef9948ecb18ff282911c1f888352466f61153886b5588d0200eae962ae' 
  AND token = 'JcH/wkhkZ7g3TqiY7k/g4Y7C2y3MlIDtKaV7UKYVkOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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