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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93d295bb72186afd854ee69262554ebfd7d6f6f68266cf99fe83159113788b7' 
  AND token = 'c5Cv+wBxY8h5TzMTkoNQdgrLSzHWyhsWiB8THMaRuXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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