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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a30c55a1f6a35365a85f791def4cfe43f5cd42b1336cde05c2d4ed182566dd6' 
  AND token = 'h05Yp/ps3AP+ZUm+egQnkSCIHFaIWPLPcFvugMVSdBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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