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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec80208975a16e9305a4c7f54537774fdbd684a36fb718ff2f4fdbf6f7afab9' 
  AND token = 'EoZkGEeHsY36VnA4WdXH/mxg66XcLJhYSluK1pMOVck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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