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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2039f83ecceb948541152417956a4bf2cfa95410daf561b0f8190e528af85a7' 
  AND token = '2+MhYJN30USlkhA3Ojx+DIgb/chiCEJqJ9iTJ7tRmrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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