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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39ecdd57c22483ab7c3910adbadb825e6c409d7d899518b5e2ad2831b0960d7' 
  AND token = 'Vg8pXLH0dS71t4G2kQrXffihsAb4kOgwnGHLwZj6v80=' 
  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"
    }
  }
}