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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ac8d6f55e3c14242cd57a7a1bd9320e68d0be74a0fb2b397be446f37d5a31a' 
  AND token = 'pZBV0cijit6hy+zl5mNOSjsqQETjRv8v4tCE5uHmN4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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