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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3f32cfb03d623f2c3b8a7369647b8b91ba21df04d8df7ad3a714616c490995' 
  AND token = '2uGlZqypLlo1zJfKKoMQNgallA3Ka7JaPby8RwS3ETE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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