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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b93d3faa0f1545480ee850c0ba58d0fb49ce3cae3eff088c230eb6cc7eacb84' 
  AND token = '6pwvulVoS+cU4t//zf3aRrkq3orthD/UmBoWSlFl8NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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