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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1eae278fe6e410f97837fe363892dbf3afa7dd4c85b6634973ef502b4fa2415' 
  AND token = 'Vr6/crlAls1WVbyjsb4K4JLGaNMdkdlaAmbaCBF0maE=' 
  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"
    }
  }
}