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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c4de23d4df8b07f852a36b35d4aaa7bcd6fb958d610b719953059aaed87c1b' 
  AND token = 'FMLjBLTsqaZ29Pzw09P0+4sTh832hQbpf5E3MHiv+tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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