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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b012df982bc8a723e7338a0d11b728bc2c774ad24e6667436db6efdee60ace3' 
  AND token = 'n6y4L/QrftNyKTvF/Qn+IRidC87kwur1ko0GXbbBR8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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