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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd619024580816277c2f459993d6c3a5b5a402cbe23c58f2153d3c2d473bb6846' 
  AND token = 'sTh4r8tDll4KcZPipAeN6mCUs6t84Y8H3k9fHc8YGlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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