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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce313b272157f7285461fca3685804823cbff7691eb897ca3a0e940b60af24ad' 
  AND token = '1Ed9fop7f5ysSURw2LyqZnLZGjofo3lKX2VKJjxbRWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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