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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8ba396cfd6811c9048f422ad0d812059acd39592572e7ee0af2346700096b5' 
  AND token = 'CtI2LL2I3kless5NsCfbynwSm0ChbAgNyIXGyZv+6Yc=' 
  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"
    }
  }
}