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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d52c053c70f4d4f8fed5e9eebeb0155e88c685603103f34312d4cc08f76db9' 
  AND token = 'RsQpHprexD1QZXd0M+5jsrUepnJNOLPC96g3i9qDLhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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