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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5bf8168e61e7bb88a11fc79865dedd333cd4f1635d4318e7d7a21ecb53138b' 
  AND token = '83+ZA4XAPKxnlyWjl3zgoTvRB3+dToGfcnfQ9HW59Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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