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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '449e7128cbce4a0af5563d55ce36918adc0f2f55f38f38a5fe7057f79accd8bc' 
  AND token = 'Z32Ql1cBI1m5QjHdf/S5hxw8xNZ7umn3scoSwA8hn2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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