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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e077cdd7c2fa2c2388ef7cf032b3de4b07abb306e67ed25401bd7f2eec26a0' 
  AND token = '3YJyErsO+9KSfNkrMg9MBNrFI8xcgnm87eLT9SZQky8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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