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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd636fe1362ff8a2ff1249d1f05402b14558bb5e0c4a5ac210bcefbb5ad700fde' 
  AND token = '72E9v2YqO3XDBxjtPuFMHs/Mt0H+MoPci9beb5ujrpk=' 
  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"
    }
  }
}