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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86be301c9faeb104d87e07680c1e70bc18f0ae3e791e6642f6155533db139c8a' 
  AND token = 'BeGtR8k8ZPP2jIiIap59K6fkxBgAcCh2LYpfc2727+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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