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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e765da4c570fcdfc6721f5e01db1fb66884d6ee19109bf179cb6c0a3e98e22e4' 
  AND token = 'qKca3Xt4pg1Dgj++M5u1Dt6aEhilzYF34hrMjCQiCsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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