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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d80683062e80a0aa9e3a16e012ed102d9b3e938d906d94e5a9baf160f9880c7' 
  AND token = 'qqNHEEMoZ2oCdwFDkOgocPTEFGW9YLjcV5ctAfUQReI=' 
  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"
    }
  }
}