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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0e3e7f8d85cdc30dd1e4b9e81bc3fe3c85a2c09b0936ccddafc250235729bd' 
  AND token = 'ZcH+wFgbhvM4I0T36j5lkJlGor45IJvEbczPnO5C3LU=' 
  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"
    }
  }
}