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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d24af68f1309ae8f1b698dba0a9ab0587232b767f549768e8b945d90a976e25' 
  AND token = 'DdpRQv7KR/zGlviNcjZUkU7FlOp67aWrWb9QyvncB3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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