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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1006a59e5b62dd49ab2a18fd4ab990e27d429f67f67d1ced8604167f111d89' 
  AND token = '3He7EopxqAUIc4DApEeOcMd5K9dYQoO5NBzz8hqs9wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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