SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f3e1bf971c257d00d483c32bba542d8d456f43413e18c3378f36c1e0f85079' 
  AND token = '5CdV+5jUHA/hePOplCYJ/5X5s8pKg7oK0tqRdylEVV4=' 
  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"
    }
  }
}