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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fe62621a7c295058e4134a176040b948bda65cd35de3e560f0a287f700707b' 
  AND token = 'VHVFCoYz3QnzkPM4Xr56uTsJD21E3o8EQEsGM9x1U6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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