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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da26e7e51949b95c0b654635d03939cacda561c134fc9cea1eec5da92ba1f067' 
  AND token = '/p+R0PhaeVoAoEz5slI+rdDJ6Kyk9beGEAl/9QCxe1c=' 
  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"
    }
  }
}