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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572af2409e1d5e389104a1149546b93ed526b078f8ffb2e5325924e3bb68b51f' 
  AND token = 'yuy6frEVAfVBjfECT7uyyoqP5glxsTLvAhqcRUlsPj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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