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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba6c55aec64e5d4c1f334eaf9cc56a8dd64db9c3053ecae0bdc67da7d8224f4' 
  AND token = 'OxKyHQoiYNrrys+SxSc+YTsj2HxSrxT45I869cKamks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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