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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38c2ced94085cd8fffe730c3e718b29d99fee9662cf23f6d3d91f82f50514a2' 
  AND token = 'Al9GuY5mLsmRrX2B9Mpzu0H8WzG31L/cH2F6W3KFp5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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