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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5936dcfab5f808d9fb94ccadc32fdc323582989c9e3d6577571d75ef31f7140' 
  AND token = 'CfvXB+/5AHs9l0OTdthIp2ckJPIoUEOvEQZdbO9X6i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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