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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035c842b4257f897dbff5c8b32d00b5fe54a6f852b840ae22991ff130182199b' 
  AND token = '1xsGTl+se53nNPZBxZ4Os/Wx5wwWOzduzn1crn1PM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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