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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038007cc6d856ca2cd55cbd55023eccb564ef7f16e9a3d2229feaa323dfbb1da' 
  AND token = '6VS8RCHLmOKEzkGSt8LDaN5dfhPwFgUE9nsrdx2wtwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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