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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17d4b8630665f3e279a61702b2d406a0ea2f249c33b8a2da0180c33bfdaacea' 
  AND token = 'bCCXjpLnAGye4HqcwiEft+u5RQPa7vZAUEcyIzvtLqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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