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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7efa59ab1b6d20fb007c55128a4b833bf5ea304875054c8e0b89049699aad3b' 
  AND token = 'LZ5BeIKbXU94EWmcVtXG5RDjKNx6Qo3KuplicMtz/Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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