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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2ed489f459b594b05de942a73aa952b037a4c9eb191bd87caef62bc28efb5e' 
  AND token = 'ZFxR3W5KtwUAJTnO9P380mlgswZdhOidTU2Mci8T1vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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