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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674136fb0b3b2b88dd8c3e94255d9b66a1434d618cfc735a12469f9530ecf1ed' 
  AND token = 'kk6Nv5G61MmT30sZWFxjz7h+Rme+EIxQ93hF6q5oMuk=' 
  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"
    }
  }
}